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</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman" size="3">Hi</font></span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman"><font size="3">I'm working on Sc-doped TiO</font><sub><font size="2">2</font></sub><font size="3">
nano-crystallites. As Sc and Ti have close atomic number, and therefore atomic
scattering factor, XRD cannot be used to differentiate between Sc and Ti, sitting
on the same Wyckoff atomic position. On the other hand, the neutron scattering
length of Sc is different from Ti. </font></font></span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><font face="Times New Roman"><span style="color:windowtext;letter-spacing:0.25pt"><font size="3">Therefore, I'm using neutron diffraction
(ND) data and X-ray diffraction (XRD) data of a few Sc-doped TiO</font><sub><font size="2">2</font></sub><font size="3"> samples
in a joint refinement using GSAS-II. Among the usual lattice parameters and </font></span><font size="3"><span lang="CS" style="color:windowtext;letter-spacing:0.25pt">sample
displacement (bragg brentano geometry; XRD) or zero shift</span><span style="color:windowtext;letter-spacing:0.25pt"> (</span><em><span style="color:windowtext;font-weight:normal">Debye</span></em><b><span style="color:windowtext">-</span></b><span style="color:windowtext">Scherrer </span><span style="color:windowtext;letter-spacing:0.25pt">; ND) the refinement includes
Ti and Sc site occupancy parameters (s.o.f) in addition to the crystallite size. These site
occupancy parameters are refined at the end, however they won't be "refined"
(refinement ends without changing the s.o.f. parameters). </span></font></font></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman" size="3">Changing these Ti/ Sc s.o.f manually
<span> </span>can give better results. It is more complicated
as there are some vacancies at the same position.</font></span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman" size="3">Does anybody have an idea how
to refine these s.o.f of Ti and Sc?</font></span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman" size="3">Best regards,</font></span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="background:white;margin:0in 0in 0pt;line-height:13.5pt" dir="LTR"><span style="color:windowtext;letter-spacing:0.25pt"><font face="Times New Roman" size="3">Victor Zenou</font></span></p><font color="#000000" face="Times New Roman" size="3">
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